Wildlife refuge · Indiana
Big Oaks National Wildlife Refuge
Big Oaks National Wildlife Refuge is run by the U.S. Fish and Wildlife Service. Its own timing: around the second week in May.
Big Oaks National Wildlife Refuge in pictures
Illustrative photos, not current conditions

What the U.S. Fish and Wildlife Service says
“The refuge covers a portion of the former Jefferson Proving Ground, a munitions testing facility operated by the U.S. Army between 1940-1995.”Visit official site ↗
When to go
In the source's own words; no peak claimed unless the source says so
- around the second week in May“April is the start of the main wave of songbird migration which peaks around the second week in May.”
Before you go
Big Oaks National Wildlife Refuge is located on a former munitions testing area and only certain areas are open to visitors because of safety concerns.
Worth the drive
60 to 100 straight-line miles away
Hoosier National Forest 75 mi
How we know
Every fact on this page, from these pages
- Sep 30Park ServiceBig Oaks National Wildlife Refuge: seasonal timing (Codex round 25; saved under research/round25/pages/)Source (opens U.S. Fish and Wildlife Service, Big Oaks National Wildlife Refuge in a new tab)
- Oct 1Park ServiceBig Oaks National Wildlife Refuge (Codex round 28)Source (opens U.S. Fish and Wildlife Service, Big Oaks National Wildlife Refuge in a new tab)
- Oct 1Park ServiceBig Oaks National Wildlife Refuge (Codex round 28)Source (opens U.S. Fish and Wildlife Service, Big Oaks National Wildlife Refuge in a new tab)